"We cannot imagine to have another failure, and so we undertook a full review of all the parts of the launch vehicle in order to ensure that everything is being cross-checked, everything has been fully tested, and everything will be successful," he said.

After December 2002's disastrous mission, satellite launches had to be done on Ariane 5 Generic rockets.

They are currently capable of carrying up to six tonnes into space. Its last launch in December, its 20th, carried the observation and reconnaissance satellite for the French defence ministry, Helios 2A.

The newer Ariane 5-ECA has much more power and can lift up to 10 tonnes of satellite into geostationary (GEO) and more into low Earth orbit (LEO).

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This is very important for Arianespace as a commercial launch company because it means if more than one satellite can go up at the same time, it can sell its services at a lower price.

"The ECA version of Ariane 5 has the scope to allow Arianespace to combine payloads without difficulties in making them complement each other," said Antonio Fabrizi, director of the launchers programme at Esa.

"At a time when the market is low and the opportunities of launch are lower - there are fewer flights than in the past - this launcher gives a great flexibility in combining the payloads."

Crucially, this puts it in a better position in the global marketplace which has suffered in the last few years from under-demand and over capacity.

"We think this launch vehicle is going to revolutionise the launch services in the world because it will bring to our customers the double launch affordability and because of the performance of this launch vehicle it will also bring single launch flexibility," sad Mr Le Gall.

The demand for big telecommunications satellites, which provide broadband telecommunications and digital TV, has dropped off as satellite technology improves meaning they do not need replacing as often.

Essentially, Ariane 5-ECA has the same technological architecture as the generic launchers, but a number of changes have been made to give it more thrust.

The main differences include more propellant in the boosters, and main Vulcain 2 cryogenic engine has been modified to improve the combustion of liquid oxygen and hydrogen.

The upper section of the Ariane 5-ECA boosters can carry 10% - about 2.5 tonnes - more propellant. The technology was used on the much older Ariane 4 launcher, which was phased out.

The new boosters are also equipped with a new nozzle which has fewer parts and so is easier and cheaper to produce.

Arianespace is the commercial launch services leader with more than a 50% share of the international market for satellites launched to GEO.

It buys up, markets, and operates Europe's rockets under a charter of the European Space Agency (ESA) and is owned by a collection of European governments, aerospace firms, banks and the French space agency CNES.

The rockets it operates include the Ariane 5s, the forthcoming Vega vehicles, and Soyuz rockets from Russian company Starsem.

Arianespace's main competitor is International Launch Services, a joint venture between Lockheed Martin in the US and the Khrunichev Space Center in Russia, which markets the Proton launch rocket, and Boeing Company's Sea Launch.